Add new UMA stats for parallelizable download

content/browser/download/download_job.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/download/download_job.h"
 
 #include "base/bind_helpers.h"
 #include "content/browser/download/download_file.h"
 #include "content/browser/download/download_item_impl.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 44 matching lines @@
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   DownloadFile* download_file = download_item_->download_file_.get();
   if (download_file) {
     BrowserThread::PostTask(
         BrowserThread::FILE, FROM_HERE,
         base::Bind(&DownloadFile::SetPotentialFileLength,
                    base::Unretained(download_file), length));
   }
 }
 
-bool DownloadJob::UsesParallelRequests() const {
-  return false;
-}
-
 void DownloadJob::CancelRequestWithOffset(int64_t offset) {}
 
+bool DownloadJob::IsParallelizable() const {
+  return false;
+}
+
 }  // namespace content